Why whey protein makes you feel fuller — but doesn't make you eat less
Dose-dependent satiating effect of whey relative to casein or soy.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A breakfast with whey protein (like milk protein) can make you feel less hungry than other proteins — but only if it's not too strong. Too much whey doesn't help more, and you still eat the same amount at lunch.
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Evidence Score
Participants are randomly assigned to treatment or control groups, minimizing bias. Considered the gold standard for testing whether an intervention causes an effect.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
A breakfast with whey protein (like milk protein) can make you feel less hungry than other proteins — but only if it's not too strong. Too much whey doesn't help more, and you still eat the same amount at lunch.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 550 / 90
Evidence Score
Participants are randomly assigned to treatment or control groups, minimizing bias. Considered the gold standard for testing whether an intervention causes an effect.
Publication
Authors
Veldhorst MA, Nieuwenhuizen AG, Hochstenbach-Waelen A, van Vught AJ, Westerterp KR, Engelen MP, Brummer RJ, Deutz NE, Westerterp-Plantenga MS
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Different protein sources suppress appetite to different degrees based on how much leucine they contain.
After consuming a small amount of whey protein, higher levels of five specific amino acids in the blood are linked to reduced feelings of hunger in healthy young adults.
In healthy young adults, a breakfast with 10% of calories from whey protein leads to lower hunger ratings compared to meals with the same calories from casein or soy protein, and this effect occurs alongside higher blood levels of five specific amino acids after eating.
Whey protein reduces hunger more than casein or soy when consumed at 10% of total daily energy, but not when consumed at 25% of total daily energy in healthy young adults, suggesting a specific energy threshold for this effect.
When healthy young adults consume a high-protein meal with 25% of energy from whey protein, their bodies produce more active GLP-1 and insulin after eating than when they consume the same amount of protein from casein or soy, but they do not feel less hungry or eat less afterward.